For a small glass, I put some compound on a big and thick piece of glass. Add some water. Mix to a paste. I double-sided tape the screen to a flat block. Place the screen down on the base and move the screen in a swirly pattern across the base, regularly changing directions and rotating the screen in small increments every now and then.
“You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you.”
― Alexander Den Heijer, Nothing You Don't Already Know
Oh gosh. Don't get me started, of all people. I'm sitting smack in the middle of the polishing candy store. But nobody seems to get past me without spending at least a thousand bucks, whether its your yacht or your groundglass.
Let us not forget the under $1,000 solution
Reviving this thread as I now need a replacement plexiglass GG for my Wehman 8x10.
On the last plexi/gg I used an orbital sander with 1000 wet/dry sandpaper. It worked nicely, the grain is much finer, but it did leave a mild hotspot.
Now I'd like to find someone who can make a fine-grained plexiglass GG for my 8x10.
Anyone out there?
Fine grain = hotspot; coarse grain = less sharp image.
Choose one.
Or I have often wondered if a coarse grain could also have a smaller fine grain centre circle.
That is why a fresnel is necessaryOriginally Posted by Ari
Not always.
A friend of mine would regularly take in my GGs for refining, they could be stock or specialty GGs.
He worked it so fine that the grain was almost imperceptible. The images really snapped into focus and there were no hotspots, ever.
The screen was darker than normal, but that was ok with me.
He has some kind of voodoo with grinding glass, but plexiglass is a different animal.
Not gonna happen on a Wehman.
Please ask him his secret. Mother Nature wants to know too.
He's a mining engineer, so he probably has access to fairy dust.
He's never told me specifics, but it is a great screen to have, if a bit dark.
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